This adds the I2C phy interface for the pn533 driver. This way the driver can be used to interact with I2C connected pn532 devices. Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>tirimbino
Michael Thalmeier
9 years ago
committed by
Samuel Ortiz
parent
9815c7cf22
commit
dd7bedcd26
@ -0,0 +1,271 @@ |
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/*
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* Driver for NXP PN533 NFC Chip - I2C transport layer |
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* |
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* Copyright (C) 2011 Instituto Nokia de Tecnologia |
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* Copyright (C) 2012-2013 Tieto Poland |
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* Copyright (C) 2016 HALE electronic |
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* |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/ |
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#include <linux/device.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/i2c.h> |
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#include <linux/nfc.h> |
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#include <linux/netdevice.h> |
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#include <linux/interrupt.h> |
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#include <net/nfc/nfc.h> |
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#include "pn533.h" |
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#define VERSION "0.1" |
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#define PN533_I2C_DRIVER_NAME "pn533_i2c" |
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struct pn533_i2c_phy { |
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struct i2c_client *i2c_dev; |
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struct pn533 *priv; |
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int hard_fault; /*
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* < 0 if hardware error occurred (e.g. i2c err) |
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* and prevents normal operation. |
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*/ |
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}; |
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static int pn533_i2c_send_ack(struct pn533 *dev, gfp_t flags) |
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{ |
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struct pn533_i2c_phy *phy = dev->phy; |
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struct i2c_client *client = phy->i2c_dev; |
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u8 ack[6] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00}; |
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/* spec 6.2.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */ |
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int rc; |
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rc = i2c_master_send(client, ack, 6); |
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return rc; |
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} |
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static int pn533_i2c_send_frame(struct pn533 *dev, |
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struct sk_buff *out) |
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{ |
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struct pn533_i2c_phy *phy = dev->phy; |
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struct i2c_client *client = phy->i2c_dev; |
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int rc; |
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if (phy->hard_fault != 0) |
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return phy->hard_fault; |
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if (phy->priv == NULL) |
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phy->priv = dev; |
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print_hex_dump_debug("PN533_i2c TX: ", DUMP_PREFIX_NONE, 16, 1, |
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out->data, out->len, false); |
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rc = i2c_master_send(client, out->data, out->len); |
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if (rc == -EREMOTEIO) { /* Retry, chip was in power down */ |
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usleep_range(6000, 10000); |
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rc = i2c_master_send(client, out->data, out->len); |
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} |
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if (rc >= 0) { |
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if (rc != out->len) |
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rc = -EREMOTEIO; |
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else |
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rc = 0; |
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} |
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return rc; |
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} |
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static void pn533_i2c_abort_cmd(struct pn533 *dev, gfp_t flags) |
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{ |
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/* An ack will cancel the last issued command */ |
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pn533_i2c_send_ack(dev, flags); |
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/* schedule cmd_complete_work to finish current command execution */ |
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if (dev->cmd != NULL) |
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dev->cmd->status = -ENOENT; |
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queue_work(dev->wq, &dev->cmd_complete_work); |
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} |
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static int pn533_i2c_read(struct pn533_i2c_phy *phy, struct sk_buff **skb) |
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{ |
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struct i2c_client *client = phy->i2c_dev; |
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int len = PN533_EXT_FRAME_HEADER_LEN + |
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PN533_STD_FRAME_MAX_PAYLOAD_LEN + |
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PN533_STD_FRAME_TAIL_LEN + 1; |
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int r; |
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*skb = alloc_skb(len, GFP_KERNEL); |
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if (*skb == NULL) |
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return -ENOMEM; |
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r = i2c_master_recv(client, skb_put(*skb, len), len); |
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if (r != len) { |
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nfc_err(&client->dev, "cannot read. r=%d len=%d\n", r, len); |
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kfree_skb(*skb); |
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return -EREMOTEIO; |
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} |
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if (!((*skb)->data[0] & 0x01)) { |
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nfc_err(&client->dev, "READY flag not set"); |
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kfree_skb(*skb); |
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return -EBUSY; |
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} |
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/* remove READY byte */ |
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skb_pull(*skb, 1); |
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/* trim to frame size */ |
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skb_trim(*skb, phy->priv->ops->rx_frame_size((*skb)->data)); |
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return 0; |
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} |
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static irqreturn_t pn533_i2c_irq_thread_fn(int irq, void *data) |
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{ |
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struct pn533_i2c_phy *phy = data; |
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struct i2c_client *client; |
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struct sk_buff *skb = NULL; |
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int r; |
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if (!phy || irq != phy->i2c_dev->irq) { |
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WARN_ON_ONCE(1); |
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return IRQ_NONE; |
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} |
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client = phy->i2c_dev; |
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dev_dbg(&client->dev, "IRQ\n"); |
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if (phy->hard_fault != 0) |
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return IRQ_HANDLED; |
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r = pn533_i2c_read(phy, &skb); |
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if (r == -EREMOTEIO) { |
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phy->hard_fault = r; |
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pn533_recv_frame(phy->priv, NULL, -EREMOTEIO); |
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return IRQ_HANDLED; |
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} else if ((r == -ENOMEM) || (r == -EBADMSG) || (r == -EBUSY)) { |
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return IRQ_HANDLED; |
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} |
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pn533_recv_frame(phy->priv, skb, 0); |
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return IRQ_HANDLED; |
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} |
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static struct pn533_phy_ops i2c_phy_ops = { |
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.send_frame = pn533_i2c_send_frame, |
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.send_ack = pn533_i2c_send_ack, |
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.abort_cmd = pn533_i2c_abort_cmd, |
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}; |
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static int pn533_i2c_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct pn533_i2c_phy *phy; |
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struct pn533 *priv; |
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int r = 0; |
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dev_dbg(&client->dev, "%s\n", __func__); |
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dev_dbg(&client->dev, "IRQ: %d\n", client->irq); |
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
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nfc_err(&client->dev, "Need I2C_FUNC_I2C\n"); |
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return -ENODEV; |
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} |
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phy = devm_kzalloc(&client->dev, sizeof(struct pn533_i2c_phy), |
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GFP_KERNEL); |
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if (!phy) |
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return -ENOMEM; |
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phy->i2c_dev = client; |
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i2c_set_clientdata(client, phy); |
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r = request_threaded_irq(client->irq, NULL, pn533_i2c_irq_thread_fn, |
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IRQF_TRIGGER_FALLING | |
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IRQF_SHARED | IRQF_ONESHOT, |
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PN533_I2C_DRIVER_NAME, phy); |
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if (r < 0) |
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nfc_err(&client->dev, "Unable to register IRQ handler\n"); |
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priv = pn533_register_device(PN533_DEVICE_PN532, |
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PN533_NO_TYPE_B_PROTOCOLS, |
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PN533_PROTO_REQ_ACK_RESP, |
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phy, &i2c_phy_ops, NULL, |
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&phy->i2c_dev->dev); |
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if (IS_ERR(priv)) { |
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r = PTR_ERR(priv); |
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goto err_register; |
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} |
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phy->priv = priv; |
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return 0; |
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err_register: |
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free_irq(client->irq, phy); |
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return r; |
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} |
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static int pn533_i2c_remove(struct i2c_client *client) |
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{ |
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struct pn533_i2c_phy *phy = i2c_get_clientdata(client); |
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dev_dbg(&client->dev, "%s\n", __func__); |
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pn533_unregister_device(phy->priv); |
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return 0; |
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} |
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static const struct of_device_id of_pn533_i2c_match[] = { |
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{ .compatible = "nxp,pn533-i2c", }, |
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{ .compatible = "nxp,pn532-i2c", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, of_pn533_i2c_match); |
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static struct i2c_device_id pn533_i2c_id_table[] = { |
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{ PN533_I2C_DRIVER_NAME, 0 }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, pn533_i2c_id_table); |
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static struct i2c_driver pn533_i2c_driver = { |
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.driver = { |
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.name = PN533_I2C_DRIVER_NAME, |
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.owner = THIS_MODULE, |
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.of_match_table = of_match_ptr(of_pn533_i2c_match), |
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}, |
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.probe = pn533_i2c_probe, |
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.id_table = pn533_i2c_id_table, |
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.remove = pn533_i2c_remove, |
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}; |
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module_i2c_driver(pn533_i2c_driver); |
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MODULE_AUTHOR("Michael Thalmeier <michael.thalmeier@hale.at>"); |
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MODULE_DESCRIPTION("PN533 I2C driver ver " VERSION); |
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MODULE_VERSION(VERSION); |
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MODULE_LICENSE("GPL"); |
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